Sirisuda Noothimthong และ Karika Kunta. (2021) RSPO model compliance promotion of oil palm smallholder farmer in Chumphon. National Institute of Development Administration:ม.ป.ท.Sirisuda Noothimthong และ Karika Kunta. 2021. RSPO model compliance promotion of oil palm smallholder farmer in Chumphon. ม.ป.ท.:National Institute of Development Administration;Sirisuda Noothimthong และ Karika Kunta. RSPO model compliance promotion of oil palm smallholder farmer in Chumphon. ม.ป.ท.:National Institute of Development Administration, 2021. Print.